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General characteristics Microsoft Lumia 640 DS RM-1077 (Lumia RM-1077) declared by the manufacturer. The high-resolution pictures of the motherboard and electronic components.


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Technical review Microsoft Lumia 640 DS RM-1077

Main and additional circuit boards Microsoft Lumia 640 DS RM-1077

Side 1
Side 2
Characteristics
Features
Type
Smartphone
OS
Microsoft Windows Phone 8.1
SIM type/size
Micro SIM
SIM
Dual SIM
Dimensions
141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in)
Weight
145 g (5.11 oz)
Display
Display type
IPS LCD
Size
5.0 inches
Resolution
720 x 1280 pixels, 16:9 ratio
PPI density
294
Protection
Corning Gorilla Glass 3
Multimedia
Main camera
8 MP
Main camera Video
1080p, 30fps
Front (selfie) camera
1 MP
Front (selfie) camera Video
720p
Audio
MP3, FM radio
Headphone jack
Mini jack 3.5 mm
Network
Technology
GSM/ 3G/ 4G LTE
LTE
Band 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28, 38, 40
Interfaces
Wi-Fi 802.11n, Bluetooth 4.0
Satellite navigation
GPS with A-GPS, GLONASS, BDS
Processor and Memory
System on a chip
Qualcomm MSM8926 Snapdragon 400
CPU
Quad-core Cortex-A7 1.2 GHz
GPU
Adreno 305
Internal memory
8 GB
RAM
1 GB
Card slot
Micro SD, up to 128 GB (dedicated slot)
Battery
Battery capacity
Li-Ion 2500 mAh
Charging port
Micro USB 2.0
Other
Announced
2015, March


Based on our experience, we made a selection of the most common malfunctions of mobile devices and evaluated the difficulty of performing repairs for each of them. The final evaluation of the difficulty of the repair is the sum of all the parameters. This difficulty rating is also applicable for all models Microsoft Lumia 640 DS RM-1077 — Lumia RM-1077 released for markets in different countries.

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